1 /***************************************************************************
2 * Copyright (C) 2010 by Simon Andreas Eugster (simon.eu@gmail.com) *
3 * This file is part of kdenlive. See www.kdenlive.org. *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 ***************************************************************************/
14 #include "spectrogram.h"
16 // Defines the number of FFT samples to store.
17 // Around 4 kB for a window size of 2000. Should be at least as large as the
18 // highest vertical screen resolution available for complete reconstruction.
19 // Can be less as a pre-rendered image is kept in space.
20 #define SPECTROGRAM_HISTORY_SIZE 1000
22 // Uncomment for debugging
23 //#define DEBUG_SPECTROGRAM
25 #ifdef DEBUG_SPECTROGRAM
29 #define MIN_DB_VALUE -120
30 #define MAX_FREQ_VALUE 96000
31 #define MIN_FREQ_VALUE 1000
33 Spectrogram::Spectrogram(QWidget *parent) :
34 AbstractAudioScopeWidget(true, parent),
38 m_parameterChanged(false)
40 ui = new Ui::Spectrogram_UI;
44 m_aResetHz = new QAction(i18n("Reset maximum frequency to sampling rate"), this);
45 m_aGrid = new QAction(i18n("Draw grid"), this);
46 m_aGrid->setCheckable(true);
49 m_menu->addSeparator();
50 m_menu->addAction(m_aResetHz);
51 m_menu->addAction(m_aGrid);
52 m_menu->removeAction(m_aRealtime);
55 ui->windowSize->addItem("256", QVariant(256));
56 ui->windowSize->addItem("512", QVariant(512));
57 ui->windowSize->addItem("1024", QVariant(1024));
58 ui->windowSize->addItem("2048", QVariant(2048));
60 ui->windowFunction->addItem(i18n("Rectangular window"), FFTTools::Window_Rect);
61 ui->windowFunction->addItem(i18n("Triangular window"), FFTTools::Window_Triangle);
62 ui->windowFunction->addItem(i18n("Hamming window"), FFTTools::Window_Hamming);
64 // Note: These strings are used in both Spectogram and AudioSpectrum. Ideally change both (if necessary) to reduce workload on translators
65 ui->labelFFTSize->setToolTip(i18n("The maximum window size is limited by the number of samples per frame."));
66 ui->windowSize->setToolTip(i18n("A bigger window improves the accuracy at the cost of computational power."));
67 ui->windowFunction->setToolTip(i18n("The rectangular window function is good for signals with equal signal strength (narrow peak), but creates more smearing. See Window function on Wikipedia."));
70 b &= connect(m_aResetHz, SIGNAL(triggered()), this, SLOT(slotResetMaxFreq()));
71 b &= connect(ui->windowFunction, SIGNAL(currentIndexChanged(int)), this, SLOT(forceUpdate()));
72 b &= connect(this, SIGNAL(signalMousePositionChanged()), this, SLOT(forceUpdateHUD()));
75 AbstractScopeWidget::init();
78 Spectrogram::~Spectrogram()
86 void Spectrogram::readConfig()
88 AbstractScopeWidget::readConfig();
90 KSharedConfigPtr config = KGlobal::config();
91 KConfigGroup scopeConfig(config, AbstractScopeWidget::configName());
93 ui->windowSize->setCurrentIndex(scopeConfig.readEntry("windowSize", 0));
94 ui->windowFunction->setCurrentIndex(scopeConfig.readEntry("windowFunction", 0));
95 m_aGrid->setChecked(scopeConfig.readEntry("drawGrid", true));
96 m_dBmax = scopeConfig.readEntry("dBmax", 0);
97 m_dBmin = scopeConfig.readEntry("dBmin", -70);
98 m_freqMax = scopeConfig.readEntry("freqMax", 0);
100 if (m_freqMax == 0) {
101 m_customFreq = false;
107 void Spectrogram::writeConfig()
109 KSharedConfigPtr config = KGlobal::config();
110 KConfigGroup scopeConfig(config, AbstractScopeWidget::configName());
112 scopeConfig.writeEntry("windowSize", ui->windowSize->currentIndex());
113 scopeConfig.writeEntry("windowFunction", ui->windowFunction->currentIndex());
114 scopeConfig.writeEntry("drawGrid", m_aGrid->isChecked());
115 scopeConfig.writeEntry("dBmax", m_dBmax);
116 scopeConfig.writeEntry("dBmin", m_dBmin);
119 scopeConfig.writeEntry("freqMax", m_freqMax);
121 scopeConfig.writeEntry("freqMax", 0);
127 QString Spectrogram::widgetName() const { return QString("Spectrogram"); }
129 QRect Spectrogram::scopeRect()
134 ui->verticalSpacer->geometry().top()+6 // Top
136 AbstractAudioScopeWidget::rect().bottomRight()
138 m_innerScopeRect = QRect(
140 m_scopeRect.left()+56, // Left
141 m_scopeRect.top()+6 // Top
143 ui->verticalSpacer->geometry().right()-70,
144 ui->verticalSpacer->geometry().bottom()-40
150 QImage Spectrogram::renderHUD(uint)
153 QTime start = QTime::currentTime();
156 const uint minDistY = 30; // Minimum distance between two lines
157 const uint minDistX = 40;
158 const uint textDistX = 10;
159 const uint textDistY = 25;
160 const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
161 const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
162 const int mouseX = m_mousePos.x() - m_innerScopeRect.left();
163 const int mouseY = m_mousePos.y() - m_innerScopeRect.top();
166 QImage hud(m_scopeRect.size(), QImage::Format_ARGB32);
167 hud.fill(qRgba(0,0,0,0));
169 QPainter davinci(&hud);
170 davinci.setPen(AbstractScopeWidget::penLight);
174 if (m_aGrid->isChecked()) {
175 for (int frameNumber = 0; frameNumber < m_innerScopeRect.height(); frameNumber += minDistY) {
176 y = topDist + m_innerScopeRect.height()-1 - frameNumber;
177 hideText = m_mouseWithinWidget && abs(y - mouseY) < (int)textDistY && mouseY < m_innerScopeRect.height() && mouseX < m_innerScopeRect.width();
179 davinci.drawLine(leftDist, y, leftDist + m_innerScopeRect.width()-1, y);
181 davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, y + 6, QVariant(frameNumber).toString());
185 // Draw a line through the mouse position with the correct Frame number
186 if (m_mouseWithinWidget && mouseY < m_innerScopeRect.height() && mouseX < m_innerScopeRect.width()) {
187 davinci.setPen(AbstractScopeWidget::penLighter);
189 x = leftDist + mouseX;
190 y = topDist + mouseY - 20;
194 if (y > (int)topDist + m_innerScopeRect.height()-1 - 30) {
195 y = topDist + m_innerScopeRect.height()-1 - 30;
197 davinci.drawLine(x, topDist + mouseY, leftDist + m_innerScopeRect.width()-1, topDist + mouseY);
198 davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX,
200 m_scopeRect.right()-m_innerScopeRect.right()-textDistX,
203 i18n("Frame\n%1", m_innerScopeRect.height()-1-mouseY));
207 const uint hzDiff = ceil( ((float)minDistX)/m_innerScopeRect.width() * m_freqMax / 1000 ) * 1000;
208 const int rightBorder = leftDist + m_innerScopeRect.width()-1;
210 y = topDist + m_innerScopeRect.height() + textDistY;
211 if (m_aGrid->isChecked()) {
212 for (uint hz = 0; x <= rightBorder; hz += hzDiff) {
213 davinci.setPen(AbstractScopeWidget::penLight);
214 x = leftDist + (m_innerScopeRect.width()-1) * ((float)hz)/m_freqMax;
216 // Hide text if it would overlap with the text drawn at the mouse position
217 hideText = m_mouseWithinWidget && abs(x-(leftDist + mouseX + 20)) < (int) minDistX + 16 && mouseX < m_innerScopeRect.width();
219 if (x <= rightBorder) {
220 davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
222 if (x+textDistY < leftDist + m_innerScopeRect.width()) {
223 // Only draw the text label if there is still enough room for the final one at the right.
225 davinci.drawText(x-4, y, QVariant(hz/1000).toString());
231 // Draw finer lines between the main lines
232 davinci.setPen(AbstractScopeWidget::penLightDots);
233 for (uint dHz = 3; dHz > 0; dHz--) {
234 x = leftDist + m_innerScopeRect.width() * ((float)hz - dHz * hzDiff/4.0f)/m_freqMax;
235 if (x > rightBorder) {
238 davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()-1);
242 // Draw the line at the very right (maximum frequency)
243 x = leftDist + m_innerScopeRect.width()-1;
244 hideText = m_mouseWithinWidget && abs(x-(leftDist + mouseX + 30)) < (int) minDistX && mouseX < m_innerScopeRect.width();
245 davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
247 davinci.drawText(x-10, y, i18n("%1 kHz").arg((double)m_freqMax/1000, 0, 'f', 1));
251 // Draw a line through the mouse position with the correct frequency label
252 if (m_mouseWithinWidget && mouseX < m_innerScopeRect.width()) {
253 davinci.setPen(AbstractScopeWidget::penThin);
254 x = leftDist + mouseX;
255 davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
256 davinci.drawText(x-10, y, i18n("%1 kHz")
257 .arg((double)(m_mousePos.x()-m_innerScopeRect.left())/m_innerScopeRect.width() * m_freqMax/1000, 0, 'f', 2));
260 // Draw the dB brightness scale
262 davinci.setPen(AbstractScopeWidget::penLighter);
263 for (y = topDist; y < (int)topDist + m_innerScopeRect.height(); y++) {
264 val = 1-((float)y-topDist)/(m_innerScopeRect.height()-1);
265 int col = qRgba(255, 255, 255, 255.0 * val);
266 for (x = leftDist-6; x >= (int)leftDist-13; x--) {
267 hud.setPixel(x, y, col);
270 const int rectWidth = leftDist-m_scopeRect.left()-22;
271 const int rectHeight = 50;
272 davinci.setFont(QFont(QFont().defaultFamily(), 10));
273 davinci.drawText(m_scopeRect.left(), topDist, rectWidth, rectHeight, Qt::AlignRight, i18n("%1\ndB", m_dBmax));
274 davinci.drawText(m_scopeRect.left(), topDist + m_innerScopeRect.height()-20, rectWidth, rectHeight, Qt::AlignRight, i18n("%1\ndB", m_dBmin));
277 emit signalHUDRenderingFinished(start.elapsed(), 1);
280 QImage Spectrogram::renderAudioScope(uint, const QVector<int16_t> audioFrame, const int freq,
281 const int num_channels, const int num_samples, const int newData) {
282 if (audioFrame.size() > 63) {
284 m_freqMax = freq / 2;
286 bool newDataAvailable = newData > 0;
288 #ifdef DEBUG_SPECTROGRAM
289 qDebug() << "New data for " << widgetName() << ": " << newDataAvailable << " (" << newData << " units)";
292 QTime start = QTime::currentTime();
294 int fftWindow = ui->windowSize->itemData(ui->windowSize->currentIndex()).toInt();
295 if (fftWindow > num_samples) {
296 fftWindow = num_samples;
298 if ((fftWindow & 1) == 1) {
302 // Show the window size used, for information
303 ui->labelFFTSizeNumber->setText(QVariant(fftWindow).toString());
305 if (newDataAvailable) {
307 float freqSpectrum[fftWindow/2];
309 // Get the spectral power distribution of the input samples,
310 // using the given window size and function
311 FFTTools::WindowType windowType = (FFTTools::WindowType) ui->windowFunction->itemData(ui->windowFunction->currentIndex()).toInt();
312 m_fftTools.fftNormalized(audioFrame, 0, num_channels, freqSpectrum, windowType, fftWindow, 0);
314 // This methid might be called also when a simple refresh is required.
315 // In this case there is no data to append to the history. Only append new data.
316 QVector<float> spectrumVector(fftWindow/2);
317 memcpy(spectrumVector.data(), &freqSpectrum[0], fftWindow/2 * sizeof(float));
318 m_fftHistory.prepend(spectrumVector);
320 #ifdef DEBUG_SPECTROGRAM
322 qDebug() << widgetName() << ": Has no new data to Fourier-transform";
326 // Limit the maximum history size to avoid wasting space
327 while (m_fftHistory.size() > SPECTROGRAM_HISTORY_SIZE) {
328 m_fftHistory.removeLast();
332 QImage spectrum(m_scopeRect.size(), QImage::Format_ARGB32);
333 spectrum.fill(qRgba(0,0,0,0));
334 QPainter davinci(&spectrum);
335 const uint w = m_innerScopeRect.width();
336 const uint h = m_innerScopeRect.height();
337 const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
338 const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
346 bool completeRedraw = true;
348 if (m_fftHistoryImg.size() == m_scopeRect.size() && !m_parameterChanged) {
349 // The size of the widget and the parameters (like min/max dB) have not changed since last time,
350 // so we can re-use it, shift it by one pixel, and render the single remaining line. Usually about
351 // 10 times faster for a widget height of around 400 px.
352 if (newDataAvailable) {
353 davinci.drawImage(0, -1, m_fftHistoryImg);
355 // spectrum = m_fftHistoryImg does NOT work, leads to segfaults (anyone knows why, please tell me)
356 davinci.drawImage(0, 0, m_fftHistoryImg);
358 completeRedraw = false;
362 if (newData || m_parameterChanged) {
363 m_parameterChanged = false;
365 for (QList<QVector<float> >::iterator it = m_fftHistory.begin(); it != m_fftHistory.end(); it++) {
367 windowSize = (*it).size();
369 for (uint i = 0; i < w; i++) {
371 // i: Pixel coordinate
372 // f: Target frequency
373 // x: Frequency array index (float!) corresponding to the pixel
375 // val: dB value at position x (Range: [-inf,0])
377 f = i/((float) w-1.0) * m_freqMax;
378 x = 2*f/freq * (windowSize - 1);
381 if (x >= windowSize) {
385 // Use linear interpolation in order to get smoother display
386 if (i == 0 || xi == windowSize-1) {
387 // ... except if we are at the left or right border of the display or the spectrum
391 if ((*it)[xi] > (*it)[xi+1]
393 // This is a hack to preserve peaks.
394 // Consider f = {0, 100, 0}
396 // Then x is 50 both times, and the 100 peak is lost.
397 // Get it back here for the first x after the peak.
400 val = (xi+1 - x) * (*it)[xi]
401 + (x - xi) * (*it)[xi+1];
405 // Normalize to [0 1], 1 corresponding to 0 dB and 0 to dbMin dB
406 val = (val-m_dBmax)/(m_dBmax-m_dBmin) + 1;
409 } else if (val > 1) {
413 spectrum.setPixel(leftDist + i, topDist + h-1 - y, qRgba(255, 255, 255, val * 255));
419 if (y >= topDist + m_innerScopeRect.height()) {
422 if (!completeRedraw) {
428 #ifdef DEBUG_SPECTROGRAM
429 qDebug() << "Rendered " << y-topDist << "lines from " << m_fftHistory.size() << " available samples in " << start.elapsed() << " ms"
430 << (completeRedraw ? "" : " (re-used old image)");
431 uint storedBytes = 0;
432 for (QList< QVector<float> >::iterator it = m_fftHistory.begin(); it != m_fftHistory.end(); it++) {
433 storedBytes += (*it).size() * sizeof((*it)[0]);
435 qDebug() << QString("Total storage used: %1 kB").arg((double)storedBytes/1000, 0, 'f', 2);
438 m_fftHistoryImg = spectrum;
440 emit signalScopeRenderingFinished(start.elapsed(), 1);
443 emit signalScopeRenderingFinished(0, 1);
447 QImage Spectrogram::renderBackground(uint) { return QImage(); }
449 bool Spectrogram::isHUDDependingOnInput() const { return false; }
450 bool Spectrogram::isScopeDependingOnInput() const { return true; }
451 bool Spectrogram::isBackgroundDependingOnInput() const { return false; }
453 void Spectrogram::handleMouseDrag(const QPoint movement, const RescaleDirection rescaleDirection, const Qt::KeyboardModifiers rescaleModifiers)
455 if (rescaleDirection == North) {
456 // Nort-South direction: Adjust the dB scale
458 if ((rescaleModifiers & Qt::ShiftModifier) == 0) {
460 // By default adjust the min dB value
461 m_dBmin += movement.y();
465 // Adjust max dB value if Shift is pressed.
466 m_dBmax += movement.y();
470 // Ensure the dB values lie in [-100, 0] (or rather [MIN_DB_VALUE, 0])
471 // 0 is the upper bound, everything below -70 dB is most likely noise
475 if (m_dBmin < MIN_DB_VALUE) {
476 m_dBmin = MIN_DB_VALUE;
478 // Ensure there is at least 6 dB between the minimum and the maximum value;
479 // lower values hardly make sense
480 if (m_dBmax - m_dBmin < 6) {
481 if ((rescaleModifiers & Qt::ShiftModifier) == 0) {
482 // min was adjusted; Try to adjust the max value to maintain the
483 // minimum dB difference of 6 dB
484 m_dBmax = m_dBmin + 6;
490 // max was adjusted, adjust min
491 m_dBmin = m_dBmax - 6;
492 if (m_dBmin < MIN_DB_VALUE) {
493 m_dBmin = MIN_DB_VALUE;
494 m_dBmax = MIN_DB_VALUE+6;
499 m_parameterChanged = true;
503 } else if (rescaleDirection == East) {
504 // East-West direction: Adjust the maximum frequency
505 m_freqMax -= 100*movement.x();
506 if (m_freqMax < MIN_FREQ_VALUE) {
507 m_freqMax = MIN_FREQ_VALUE;
509 if (m_freqMax > MAX_FREQ_VALUE) {
510 m_freqMax = MAX_FREQ_VALUE;
514 m_parameterChanged = true;
522 void Spectrogram::slotResetMaxFreq()
524 m_customFreq = false;
525 m_parameterChanged = true;
530 void Spectrogram::resizeEvent(QResizeEvent *event)
532 m_parameterChanged = true;
533 AbstractAudioScopeWidget::resizeEvent(event);
536 #undef SPECTROGRAM_HISTORY_SIZE
537 #ifdef DEBUG_SPECTROGRAM
538 #undef DEBUG_SPECTROGRAM